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Spectrum sensing is a key technology in establishing and developing cognitive radio networks. High efficiency, reliability and real time are the most important required parameters for accurate sensing process. Wideband sensing is the main factor to achieve reliability of sensing process. Shadowing, fading and aliasing problems of signals affect the performance of spectrum sensing process therefore;...
Spectrum sensing is the core process in cognitive radio networks. Spectrum sensing of wideband signal results in enhancement of system reliability and effectiveness. In this paper, a modified system of wideband spectrum sensing based on non-uniform Multi-coset samplers is proposed. The proposed system is designed to work on totally blind input wideband signal. Lomb-Scargle periodogram is used to detect...
An UWB low noise amplifier exploiting current reused and linearization technique was designed using 0.18 um CMOS process. Post-distortion (PD) technique has applied to improve the linearity. The proposed design achieves +1dBm IIP3 measurement result, around 3dB noise figure, high and flat S21 of 15 dB, over a frequency range 3.1–10.6 GHz simulation results. The proposed design has consumed 18mW. The...
A new differential drive CMOS rectifier topology has been provided for RF wireless energy harvesting of low input power applications as implantable devices. It applies a dynamic threshold compensation technique by gate biasing of selected MOS switches with external bootstrapping circuit. The proposed architecture has been simulated in 0.18μm CMOS technology. The performance of the circuit is evaluated...
The charge-steering concept is applied to opamps as a means of conserving power. The opamp is the heart of the sigma-delta modulator circuit and the part in which the major portion of the power consumption is dissipated. This work presents a dual mode sigma-delta modulator for two wireless standards, GSM and Bluetooth. It achieves dual-mode operation with the same sampling frequency, while the capacitor...
The conventional current-steering Opamp is the building block of sigma-delta modulator circuits. It is also the major power consuming part of the circuit. The chargesteering concept can be applied to Opamps to obtain minimum power consumption. The two-stage charge-steering Opamp has been designed using 0.18um TSMC CMOS technology that consumes 0.23 mW power at a 48 MHz sampling frequency. A 2nd order,...
In this paper, we analyze the feedforward charge injection technique (FCIT) in a continuous time delta-sigma modulator (CTDSM) and explain the theory behind improvement of SNR. We find that the feedforward charge injection technique (FCIT) in a CTDSM significantly reduces the node voltage swing at the input of the operational transconductance amplifier (OTA) and thereby relaxes the design constraint...
Typical and proposed recycling folded cascade (RFC) amplifier have been designed in TSMC 0.18 μm. Simulated and measured results are compared. Proposed RFC demonstrate an enhancement on DC gain by 5 dB almost for the same power consumption and bandwidth. Moreover, it realized less input referred noise than typical. Split-length devices (SLD) method is applied on proposed (RFC) to create...
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